Low expansion alloy with the lowest thermal expansion coefficient of any of the iron-nickel alloys. Uses include balance wheels for clocks and watches, bi-metal strip, glass-to-metal seals and structural components in laser systems.

Electrical Properties

Electrical resistivity ( µOhmcm )

75-85

Magnetic Properties

Curie temperature ( C )

279

Mechanical Properties

Elongation at break ( % )

<45

Hardness - Brinell

160

Modulus of elasticity ( GPa )

140-150

Tensile strength ( MPa )

450-590

Physical Properties

Density ( g cm-3 )

8.0

Melting point ( C )

1427

Thermal Properties

Coefficient of thermal expansion @20-90C ( x10-6 K-1 )

1.7-2.0

Specific heat @23C ( J K-1 kg-1 )

515

Thermal conductivity @23C ( W m-1 K-1 )

13

All information and technical data are given as a guide only. Although
every effort has been made to ensure that the information is correct, no
warranty is given as to its completeness or accuracy.